| HPA的非线性对DAB信号的影响 |
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| 引用本文： | 陈国庆,高文焕,王志华,吴恩德.HPA的非线性对DAB信号的影响[J].清华大学学报(自然科学版),2001,41(7):47-50. |
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| 作者姓名： | 陈国庆 高文焕 王志华 吴恩德 |
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| 作者单位： | 清华大学电子工程系, |
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| 基金项目： | 清华大学“九八五”项目 |
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| 摘 要： | 为更好地抑制带外噪声 ,减小信道间的干扰 ,在对Eureka 147DAB(数字音频广播 )信号调制过程进行介绍后 ,从频谱扩展的角度分析了 HPA (高功率放大器 )对 DAB信号的影响。分析过程中 ,HPA采用典型的 TWTA(行波管放大器 )模型 ,其非线性程度用输出功率回退 B描述。分析结果表明 ,随着 B线性增加 ,带外噪声幅度线性减小。在不加滤波器的情况下 ,离中心频率较近的带外噪声欲满足DAB发射信号频谱标准 ,B至少要在 9d B以上。分析结果为 DAB发射系统的设计提供了必要的参考依据
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| 关 键 词： | 非线性 高功率放大器 数字音频广播 带外噪声 正交频分复用 |
| 文章编号： | 1000-0054（2001）07-0047-04 |
| 修稿时间： | 2000年8月29日 |
Effects of HPA nonlinearities on DAB signals |
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| CHEN Guoqing,GAO Wenhuan,WANG Zhihua,WU Ende.Effects of HPA nonlinearities on DAB signals[J].Journal of Tsinghua University(Science and Technology),2001,41(7):47-50. |
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| Authors: | CHEN Guoqing GAO Wenhuan WANG Zhihua WU Ende |
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| Abstract: | The out of band noises of Eureka 147 DAB (digital audio broadcasting) signals produced by HPA (high power amplifier) nonlinearities were analyzed to reduce the interference to adjacent channels. The analysis used a typical TWTA (traveling wave tube amplifier) model with B (output backoff) to describe its nonlinearities. The results show that the linear increase of the B results in a linear decrease of the out of band noise power. Without a RF filter, B should be more than 9dB so that the out of band noises near the central frequency can achieve the DAB transmitting signal criterion. This result provides a necessary improvement for the design of DAB transmitting systems. |
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| Keywords: | nonlinearity HPA (high power amplifier) DAB (digital audio broadcasting) out of band noises OFDM (orthogonal frequency division multiplexing) |
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